Grenades fired from the Underbarrel Grenade Launcher are less potent than standard Frag Grenades, with a significantly lower maximum indirect damage, however carrying the advantage of being able to damage infantry on direct hit.

When directly hitting infantry, the Grenade will explode to deal 1000 damage, unless the target is within 15 meters, at which point the Grenade will become a dud and not explode, instead dealing 800 damage to the target. The explosion deals 500 damage to anyone within 5 meters, however will deal no damage past this range.

Each faction's Underbarrel Grenade Launcher is visually distinct, however they are all functionally identical.

To use an underbarrel attachment, press the Gear Slot 1 hotkey (1 by default) whilst the attached weapon is equipped.